Relief-valve.



No. 770,824.. PATENTED SEPT. 27, 1904.

F. SGH'REIDT.

RELIEF VALVE.

APPLIOATION 211.21) Home, 1903;

2 anus-sum 1,

NO MODEL.

No. 770,824- PATENTED SEPT. 27, 1904-.

I. SGHREIDT.

RELIEF VALVE.

APPLICATION FILED NOV. 9, 1903.

N0 MODEL, 2 SHEETS-SHEET2.

mventoz ihgmoep M Patented September 27, 1904.

PATENT Grrroe.

FRANK SCHREIDT, OF MANSFIELD, OHIO.

RELIEF-VALVE.

SPECIFICATION forming part of Letters Patent No. 770,824, datedSeptember 27, 1904.

Application filed November 9, 1903. Serial No. 180,3L8. (N0 model.)

in action and cheaper in construction.

I have illustrated several modifications of my improvements in theaccompanyingdrawings, in which- Figure 1 is a central sectional view ofa valve, showing my improvements in the main valve, the auxiliary valve,and the hand-stem for actuating the main valve. Fig. 2 is a horizontalsectional view taken on linew w of Fig. 1. Figs. 3, 5, and 7 aresectional views similar to Fig. 1 of modifications of the main valve.Fig. 4 is a vertical sectional view on line ,2 2 of Fig. 1. Fig. 6 is aplan view of the main valve shown in Fig. 5. Fig. 8 is a similar view ofthe main valve shown in Fig. 7.

I will describe first the improvements made in the auxiliary valve,since these are the same in all the modifications.

I have screw-threaded the outlet-opening a of the main valve Ainteriorly, and into this screw-threaded extension (0 I engage the upperexteriorly-screw-threaded extension I) of the auxiliary casing B, whichis formed with an annular seat 6 at the base of the extension 6. Againstseat 6 the auxiliary valve 6 seats. The lower end of valve-casing B isinteriorly screw-threaded, and into it is fitted a coupling If, whichhas at its upper end a cross-bar 6*, which supports a bearing 5 for thevalvestem 6, which is surrounded byacoiled spring 72 The advantage ofthe construction of the auxiliary valve is that it enables me to makethe outlet-opening of the main valve A of a size to be readily coupledto pipes, so that if it be not desired to use the auxiliary valve, as incases where the engine is not a vacuumengine, the auxiliary valve may bereadily omitted and the main valve may be coupled up to the pipeswithout any changes.

In the modification of the main valve shown in Fig. l the interior ofthe valve-casing is enlarged at a. The main valve 0 has above itsenlarged disk 0 an upwardly-projecting annular flange c, at the base ofwhich are made a series of perforations c in a position such that whenthe valve rests upon its seat a the perforations 0 come immediatelybelow the upper reduced portion a of the interior of the valve-casingand that as soon as the valve has been raised from its seat the flange 0is carried up into the reduced portion a and the perforations are closedthereby. These perforations c are made small, so that while steam passesthrough them readily into the chamber a above disk 0 water will not passthrough them readily, but is throttled by reason of their diminutivesize, so that as soon as water is carried into the valve-casing Aunderneath the flange 0 it is quickly carried upward, so that no waterenters the chamber a, and that as soon as the water has been dischargedfrom the valve and the pressure below the disk 0 has been reduced thesteam remaining in the chamber (0' will carry the main valve to itsseat.

The valve-casing A has upon its side an annular boss a and a perforationthrough which projects the end of hand-stem D beneath the disk 0. Thishand-stem projects inward a distance such that the end of the cam (Zcomes in vertical alinement above the lower end 0 of the main valve, sothat should it be desired to remove the main valve C from thevalvecasing this may be done by taking off the cap E without removingthe hand-stem D, since the lower end 0' in removing the valve would notinterfere with the end (Z. Boss a has upon its interior aninwardly-projecting lug a, which extends partly around the circumferenceof the'boss. Stem D has a longitudinal lug d which contacts the lug a,so as to limit the rotation of the stem in both directions. When the lugd is in its lowermost position, the cam (Z has raised the valve Cthoroughly from its seat. The longitudinal lug a likewise contacts theexterior wall of the casing in order to limit the distance the stem Dmay extend into the interior of the casing. Valve-stem D has likewise acollar tle water.

d, which stands flush with the outer edge of the boss (0 and about whichis placed a packing 6Z3, which is held in place by a flanged nut (i Bymaking the stem project beneath the flange 0 I avoid making two flangeson the valve, as shown in my aforesaid patents.

Referring to Fig. 3, the main valve 0 has its central tubular stem 0extended upwardly above the flange 0* and projecting into adownwardly-projecting annular flange e of the cap. The flange 0* hasseated in it a packing-ring 0 The tubular stem 0 has below the flange cperforations c and above the flange and immediately beneath the lowerend of the annular flange 0 when the valve is seated a series ofcontracted perforations 0 These perforations are made of a size suchthat when the valve is seated steam passes freely into the chamber a,but water would be throttled thereby. As soon as water enters the mainbody a and comes in contact with the disk 0 the valve is raised and theperforations 0 are covered by the extension 0.

In Fig. 5 the enlarged cylindrical end 0 of the main valve C has formedin it a chamber 0, in the lower wall of which are a series ofperforations 0 and in the upper wall of which are a series ofperforations o both sets of perforations being contracted, so as toallow afree passage of steam, but to throt- Should any water get intothe chamber 0", it would not have suflicient'pressure to get through theperforations o into the chamber a. As soon as the valve is raised by thepressure of water underneath the cylinder the water would flow out ofthe main body (0 and if any water happened to get into the chamber a itwould likewise be discharged therefrom.

In the modification shown in Fig. 7 the disk 0 is placed on the stem 0in a position such that when the valve is seated it stands below thecontracted portion a a very small distance such that the opening whileallowing steam to pass would throttle water. Upon disk 0 are placed aseries of "upwardly-projecting wings 0 What I claim is-- 1. In arelief-valve the combination of a Valve-casing having an inlet and anoutlet opening, a main valve closing the outlet-opening and having anenlarged portion at the end opposite the outlet-opening contacting thewalls of the valve-casing and forming a chamber therewith, and locatedbetween the chamber and the body of the valve-casing a series ofpassages contracted to a size such as to allow steam therethrough but tothrottle the flow of liquids therethrough substantially as shown anddescribed' 2. A valve-casing having an inlet and an outlet opening, avalve to close the outletopening and having an enlarged portioncontacting the walls of the casing and forminga chamber within thevalve-casing at the opposite end of the valve from the seat, and aseries of passages leading into the chamber and in a position such thatwhen the valve is seated they are open, and when the valve is raisedthey are closed substantially as shown and described.

3. A valve-casing having an inlet and an outlet opening and an uppercontracted portion, a valve seated against the outlet-opening and havingan enlarged portion to contact the contracted portion of thevalve-casing and forming therewith a chamber, perforations in the valveleading into the chamber and standing below the contracted portion ofthe valve-casing when the valve is seated and to be carried into and tobe closed by the contracted portion when the valve is raised.

L. The combination of a valve-casing having an inlet-opening and aninteriorly-screwthreaded extension forming an outlet-opening, a mainvalve in the casing seated against the outlet-opening, an auxiliaryvalve-casing having an exteriorly-screw-threaded extension to fit intothe outlet extension of the main valve and an auxiliary valve seatedupwardly against the extension of the auxiliary casing substantially asshown and described.-

5. The combination of a valve-casing having an inlet and an outletopening, a-main valve seated against the outlet-opening and having anenlarged flange contacting the walls of the casing and forming therewitha chamber at the endopposite the outlet-opening, passages for placingthe chamber in communication with the body of the valve-casing when thevalve is seated and a hand-stem projecting through the valve-casingbeneath the flange substantially as shown and described.

FRANK SCHREIDT.

Witnesses:

F. H. BOGARDUS, GnAs. E. SCHREIDT.

